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+ id 1SprgR-0000e7-CG; Fri, 13 Jul 2012 22:02:11 -0400\r
+Date: Fri, 13 Jul 2012 22:02:11 -0400\r
+From: Austin Clements <amdragon@MIT.EDU>\r
+To: Peter Feigl <craven@gmx.net>\r
+Subject: Re: [PATCH v5 2/3] Add structured output formatter for JSON and text.\r
+Message-ID: <20120714020211.GC31670@mit.edu>\r
+References: <20120710191331.GE7332@mit.edu>\r
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+\r
+Quoth Peter Feigl on Jul 13 at 10:11 am:\r
+> From: <craven@gmx.net>\r
+> \r
+> Using the new structured printer support in sprinter.h, implement\r
+> sprinter_json_create, which returns a new JSON structured output\r
+> formatter. The formatter prints output similar to the existing JSON, but\r
+> with differences in whitespace (mostly newlines, --output=summary prints\r
+> the entire message summary on one line, not split across multiple lines).\r
+> \r
+> Also implement a "structured" formatter that prints the current plain\r
+> text format. This passes all tests, but the exact formatting is probably\r
+> specific to notmuch-search and cannot easily (if at all) be adapted to\r
+> be used across all of notmuch-{search,reply,show,...}.\r
+> ---\r
+> Makefile.local | 2 +\r
+> sprinter-json.c | 184 +++++++++++++++++++++++++++++++++++++++++++++++\r
+> sprinter-text-search.c | 190 +++++++++++++++++++++++++++++++++++++++++++++++++\r
+> sprinter.h | 8 +++\r
+> 4 files changed, 384 insertions(+)\r
+> create mode 100644 sprinter-json.c\r
+> create mode 100644 sprinter-text-search.c\r
+> \r
+> diff --git a/Makefile.local b/Makefile.local\r
+> index a890df2..b6c7e0c 100644\r
+> --- a/Makefile.local\r
+> +++ b/Makefile.local\r
+> @@ -290,6 +290,8 @@ notmuch_client_srcs = \\r
+> notmuch-show.c \\r
+> notmuch-tag.c \\r
+> notmuch-time.c \\r
+> + sprinter-json.c \\r
+> + sprinter-text-search.c \\r
+> query-string.c \\r
+> mime-node.c \\r
+> crypto.c \\r
+> diff --git a/sprinter-json.c b/sprinter-json.c\r
+> new file mode 100644\r
+> index 0000000..215151d\r
+> --- /dev/null\r
+> +++ b/sprinter-json.c\r
+> @@ -0,0 +1,184 @@\r
+> +#include <stdbool.h>\r
+> +#include <stdio.h>\r
+> +#include <talloc.h>\r
+> +#include "sprinter.h"\r
+> +\r
+> +struct sprinter_json {\r
+> + struct sprinter vtable;\r
+> + FILE *stream;\r
+> + /* Top of the state stack, or NULL if the printer is not currently\r
+> + * inside any aggregate types. */\r
+> + struct json_state *state;\r
+> +\r
+> + /* A flag to signify that a separator should be inserted in the\r
+> + * output as soon as possible.\r
+> + */\r
+> + notmuch_bool_t insert_separator;\r
+> +};\r
+> +\r
+> +struct json_state {\r
+> + struct json_state *parent;\r
+> + /* True if nothing has been printed in this aggregate yet.\r
+> + * Suppresses the comma before a value. */\r
+> + notmuch_bool_t first;\r
+> + /* The character that closes the current aggregate. */\r
+> + char close;\r
+> +};\r
+> +\r
+> +/* Helper function to set up the stream to print a value. If this\r
+> + * value follows another value, prints a comma. */\r
+> +static struct sprinter_json *\r
+> +json_begin_value (struct sprinter *sp)\r
+> +{\r
+> + struct sprinter_json *spj = (struct sprinter_json *) sp;\r
+> +\r
+> + if (spj->state) {\r
+> + if (! spj->state->first) {\r
+> + fputc (',', spj->stream);\r
+> + if (spj->insert_separator) {\r
+> + fputc ('\n', spj->stream);\r
+> + spj->insert_separator = FALSE;\r
+> + } else\r
+> + fputc (' ', spj->stream);\r
+> + } else\r
+> + spj->state->first = FALSE;\r
+> + }\r
+> + return spj;\r
+> +}\r
+> +\r
+> +/* Helper function to begin an aggregate type. Prints the open\r
+> + * character and pushes a new state frame. */\r
+> +static void\r
+> +json_begin_aggregate (struct sprinter *sp, char open, char close)\r
+> +{\r
+> + struct sprinter_json *spj = json_begin_value (sp);\r
+> + struct json_state *state = talloc (spj, struct json_state);\r
+> +\r
+> + fputc (open, spj->stream);\r
+> + state->parent = spj->state;\r
+> + state->first = TRUE;\r
+> + state->close = close;\r
+> + spj->state = state;\r
+> +}\r
+> +\r
+> +static void\r
+> +json_begin_map (struct sprinter *sp)\r
+> +{\r
+> + json_begin_aggregate (sp, '{', '}');\r
+> +}\r
+> +\r
+> +static void\r
+> +json_begin_list (struct sprinter *sp)\r
+> +{\r
+> + json_begin_aggregate (sp, '[', ']');\r
+> +}\r
+> +\r
+> +static void\r
+> +json_end (struct sprinter *sp)\r
+> +{\r
+> + struct sprinter_json *spj = (struct sprinter_json *) sp;\r
+> + struct json_state *state = spj->state;\r
+> +\r
+> + fputc (spj->state->close, spj->stream);\r
+> + spj->state = state->parent;\r
+> + talloc_free (state);\r
+> + if (spj->state == NULL)\r
+> + fputc ('\n', spj->stream);\r
+> +}\r
+> +\r
+> +static void\r
+> +json_string (struct sprinter *sp, const char *val)\r
+> +{\r
+> + static const char *const escapes[] = {\r
+> + ['\"'] = "\\\"", ['\\'] = "\\\\", ['\b'] = "\\b",\r
+> + ['\f'] = "\\f", ['\n'] = "\\n", ['\t'] = "\\t"\r
+> + };\r
+> + struct sprinter_json *spj = json_begin_value (sp);\r
+> +\r
+> + fputc ('"', spj->stream);\r
+> + for (; *val; ++val) {\r
+> + unsigned char ch = *val;\r
+> + if (ch < ARRAY_SIZE (escapes) && escapes[ch])\r
+> + fputs (escapes[ch], spj->stream);\r
+> + else if (ch >= 32)\r
+> + fputc (ch, spj->stream);\r
+> + else\r
+> + fprintf (spj->stream, "\\u%04x", ch);\r
+> + }\r
+> + fputc ('"', spj->stream);\r
+> +}\r
+> +\r
+> +static void\r
+> +json_integer (struct sprinter *sp, int val)\r
+> +{\r
+> + struct sprinter_json *spj = json_begin_value (sp);\r
+> +\r
+> + fprintf (spj->stream, "%d", val);\r
+> +}\r
+> +\r
+> +static void\r
+> +json_boolean (struct sprinter *sp, notmuch_bool_t val)\r
+> +{\r
+> + struct sprinter_json *spj = json_begin_value (sp);\r
+> +\r
+> + fputs (val ? "true" : "false", spj->stream);\r
+> +}\r
+> +\r
+> +static void\r
+> +json_null (struct sprinter *sp)\r
+> +{\r
+> + struct sprinter_json *spj = json_begin_value (sp);\r
+> +\r
+> + fputs ("null", spj->stream);\r
+> +}\r
+> +\r
+> +static void\r
+> +json_map_key (struct sprinter *sp, const char *key)\r
+> +{\r
+> + struct sprinter_json *spj = (struct sprinter_json *) sp;\r
+> +\r
+> + json_string (sp, key);\r
+> + fputs (": ", spj->stream);\r
+> + spj->state->first = TRUE;\r
+> +}\r
+> +\r
+> +static void\r
+> +json_set_prefix (unused (struct sprinter *sp), unused (const char *name))\r
+> +{\r
+> +}\r
+> +\r
+> +static void\r
+> +json_separator (struct sprinter *sp)\r
+> +{\r
+> + struct sprinter_json *spj = (struct sprinter_json *) sp;\r
+> +\r
+> + spj->insert_separator = TRUE;\r
+> +}\r
+> +\r
+> +struct sprinter *\r
+> +sprinter_json_create (const void *ctx, FILE *stream)\r
+> +{\r
+> + static const struct sprinter_json template = {\r
+> + .vtable = {\r
+> + .begin_map = json_begin_map,\r
+> + .begin_list = json_begin_list,\r
+> + .end = json_end,\r
+> + .string = json_string,\r
+> + .integer = json_integer,\r
+> + .boolean = json_boolean,\r
+> + .null = json_null,\r
+> + .map_key = json_map_key,\r
+> + .separator = json_separator,\r
+> + .set_prefix = json_set_prefix,\r
+> + }\r
+> + };\r
+> + struct sprinter_json *res;\r
+> +\r
+> + res = talloc (ctx, struct sprinter_json);\r
+> + if (! res)\r
+> + return NULL;\r
+> +\r
+> + *res = template;\r
+> + res->stream = stream;\r
+> + return &res->vtable;\r
+> +}\r
+> diff --git a/sprinter-text-search.c b/sprinter-text-search.c\r
+> new file mode 100644\r
+> index 0000000..95ed9cb\r
+> --- /dev/null\r
+> +++ b/sprinter-text-search.c\r
+> @@ -0,0 +1,190 @@\r
+> +#include <stdbool.h>\r
+> +#include <stdio.h>\r
+> +#include <talloc.h>\r
+> +#include "sprinter.h"\r
+> +\r
+> +/* "Structured printer" interface for unstructured text printing.\r
+> + * This is at best a misuse of the interface, but it simplifies the code\r
+> + * in notmuch-search.c considerably.\r
+> + */\r
+> +\r
+> +struct sprinter_text_search {\r
+> + struct sprinter vtable;\r
+> + FILE *stream;\r
+> +\r
+> + /* The current name or prefix to be printed with string/integer/boolean\r
+> + * data.\r
+> + */\r
+> + const char *current_name;\r
+\r
+"current_prefix"? Or maybe just "prefix"? This is the only place\r
+where you use the term "name" for this.\r
+\r
+> +\r
+> + /* A flag to indicate if this is the first tag. Used in list of tags\r
+> + * for summary.\r
+> + */\r
+> + notmuch_bool_t first_tag;\r
+> +};\r
+> +\r
+> +/* struct text_search_state { */\r
+> +/* struct text_search_state *parent; */\r
+> +/* }; */\r
+\r
+Left over scratch code?\r
+\r
+> +\r
+> +static notmuch_bool_t\r
+> +current_context (struct sprinter_text_search *sptxt, const char *marker)\r
+> +{\r
+> + return (sptxt->current_name != NULL\r
+> + && ! strncmp (marker, sptxt->current_name, strlen (marker)));\r
+> +}\r
+\r
+All of this context stuff seems way more complicated than having a few\r
+special cases in notmuch-search.c. This is, in effect, just moving\r
+this special casing from there to here, but since the text format is\r
+highly irregular, attempting to generalize it is only going to\r
+obfuscate it.\r
+\r
+I think the simplest and most readable thing to do is to make all of\r
+these functions no-ops (literally empty function bodies) except\r
+text_search_separator and text_search_set_prefix, which should be like\r
+you have them, and text_search_string:\r
+\r
+static void\r
+text_search_string (struct sprinter *sp, const char *val)\r
+{\r
+ struct sprinter_text_search *sptxt = (struct sprinter_text_search *) sp;\r
+\r
+ if (sptxt->current_name)\r
+ fprintf (sptxt->stream, "%s:", sptxt->current_name);\r
+ print_sanitized_string (sptxt->stream, val);\r
+}\r
+\r
+For the summary output, you'll have to format the summary line in\r
+notmuch-search.c, much like you did in v4, which was a much simpler\r
+and more readable way to put together the text format lines.\r
+\r
+> +\r
+> +static void\r
+> +print_sanitized_string (FILE *stream, const char *str)\r
+> +{\r
+> + if (NULL == str)\r
+> + return;\r
+> +\r
+> + for (; *str; str++) {\r
+> + if ((unsigned char) (*str) < 32)\r
+> + fputc ('?', stream);\r
+> + else\r
+> + fputc (*str, stream);\r
+> + }\r
+> +}\r
+> +\r
+> +static void\r
+> +text_search_begin_map (unused (struct sprinter *sp))\r
+> +{\r
+> +}\r
+> +\r
+> +static void\r
+> +text_search_begin_list (struct sprinter *sp)\r
+> +{\r
+> + struct sprinter_text_search *sptxt = (struct sprinter_text_search *) sp;\r
+> +\r
+> + if (current_context (sptxt, "tags")) {\r
+> + fputs (" (", sptxt->stream);\r
+> + sptxt->first_tag = TRUE;\r
+> + }\r
+> +}\r
+> +\r
+> +static void\r
+> +text_search_end (struct sprinter *sp)\r
+> +{\r
+> + struct sprinter_text_search *sptxt = (struct sprinter_text_search *) sp;\r
+> +\r
+> + if (current_context (sptxt, "tags")) {\r
+> + fputc (')', sptxt->stream);\r
+> + sptxt->current_name = NULL;\r
+> + }\r
+> +}\r
+> +\r
+> +static void\r
+> +text_search_string (struct sprinter *sp, const char *val)\r
+> +{\r
+> + struct sprinter_text_search *sptxt = (struct sprinter_text_search *) sp;\r
+> +\r
+> + if (sptxt->current_name != NULL) {\r
+> + if (current_context (sptxt, "thread"))\r
+> + fprintf ( sptxt->stream, "thread:%s ", val);\r
+> + else if (current_context (sptxt, "date_relative"))\r
+> + fprintf ( sptxt->stream, "%12s ", val);\r
+> + else if (current_context (sptxt, "authors")) {\r
+> + print_sanitized_string (sptxt->stream, val);\r
+> + fputs ("; ", sptxt->stream);\r
+> + } else if (current_context (sptxt, "subject"))\r
+> + print_sanitized_string (sptxt->stream, val);\r
+> + else if (current_context (sptxt, "tags")) {\r
+> + if (! sptxt->first_tag)\r
+> + fputc (' ', sptxt->stream);\r
+> + else\r
+> + sptxt->first_tag = FALSE;\r
+> +\r
+> + fputs (val, sptxt->stream);\r
+> + } else {\r
+> + fputs (sptxt->current_name, sptxt->stream);\r
+> + fputc (':', sptxt->stream);\r
+> + fputs (val, sptxt->stream);\r
+> + }\r
+> + } else {\r
+> + fputs (val, sptxt->stream);\r
+> + }\r
+> +}\r
+> +\r
+> +static void\r
+> +text_search_integer (struct sprinter *sp, int val)\r
+> +{\r
+> + struct sprinter_text_search *sptxt = (struct sprinter_text_search *) sp;\r
+> +\r
+> + if (sptxt->current_name != NULL) {\r
+> + if (current_context (sptxt, "matched"))\r
+> + fprintf ( sptxt->stream, "[%d/", val);\r
+> + else if (current_context (sptxt, "total"))\r
+> + fprintf ( sptxt->stream, "%d] ", val);\r
+> + } else\r
+> + fprintf (sptxt->stream, "%d", val);\r
+> +}\r
+> +\r
+> +static void\r
+> +text_search_boolean (struct sprinter *sp, notmuch_bool_t val)\r
+> +{\r
+> + struct sprinter_text_search *sptxt = (struct sprinter_text_search *) sp;\r
+> +\r
+> + fputs (val ? "true" : "false", sptxt->stream);\r
+> +}\r
+> +\r
+> +static void\r
+> +text_search_null (struct sprinter *sp)\r
+> +{\r
+> + struct sprinter_text_search *sptxt = (struct sprinter_text_search *) sp;\r
+> +\r
+> + fputs ("null", sptxt->stream);\r
+> +}\r
+> +\r
+> +static void\r
+> +text_search_map_key (struct sprinter *sp, const char *key)\r
+> +{\r
+> + struct sprinter_text_search *sptxt = (struct sprinter_text_search *) sp;\r
+> +\r
+> + sptxt->current_name = key;\r
+> +}\r
+> +\r
+> +static void\r
+> +text_search_separator (struct sprinter *sp)\r
+> +{\r
+> + struct sprinter_text_search *sptxt = (struct sprinter_text_search *) sp;\r
+> +\r
+> + fputc ('\n', sptxt->stream);\r
+> +}\r
+> +\r
+> +static void\r
+> +text_search_set_prefix (struct sprinter *sp, const char *name)\r
+> +{\r
+> + struct sprinter_text_search *sptxt = (struct sprinter_text_search *) sp;\r
+> +\r
+> + sptxt->current_name = name;\r
+> +}\r
+> +\r
+> +struct sprinter *\r
+> +sprinter_text_search_create (const void *ctx, FILE *stream)\r
+> +{\r
+> + static const struct sprinter_text_search template = {\r
+> + .vtable = {\r
+> + .begin_map = text_search_begin_map,\r
+> + .begin_list = text_search_begin_list,\r
+> + .end = text_search_end,\r
+> + .string = text_search_string,\r
+> + .integer = text_search_integer,\r
+> + .boolean = text_search_boolean,\r
+> + .null = text_search_null,\r
+> + .map_key = text_search_map_key,\r
+> + .separator = text_search_separator,\r
+> + .set_prefix = text_search_set_prefix,\r
+> + }\r
+> + };\r
+> + struct sprinter_text_search *res;\r
+> +\r
+> + res = talloc (ctx, struct sprinter_text_search);\r
+> + if (! res)\r
+> + return NULL;\r
+> +\r
+> + *res = template;\r
+> + res->stream = stream;\r
+> + return &res->vtable;\r
+> +}\r
+> diff --git a/sprinter.h b/sprinter.h\r
+> index c9cd6a6..4241d65 100644\r
+> --- a/sprinter.h\r
+> +++ b/sprinter.h\r
+> @@ -47,4 +47,12 @@ typedef struct sprinter {\r
+> void (*separator)(struct sprinter *);\r
+> } sprinter_t;\r
+> \r
+> +/* Create a new unstructured printer that emits the default Text format for search. */\r
+\r
+Wrap at 70 columns.\r
+\r
+> +struct sprinter *\r
+> +sprinter_text_search_create (const void *ctx, FILE *stream);\r
+> +\r
+> +/* Create a new structure printer that emits JSON. */\r
+> +struct sprinter *\r
+> +sprinter_json_create (const void *ctx, FILE *stream);\r
+> +\r
+> #endif // NOTMUCH_SPRINTER_H\r
projects / notmuch-archives.git / commitdiff